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Method for continuous production of hydrolysate by methylchlorosilane concentrated acid hydrolyzing

A technology for hydrolysis of methyl chlorosilane and concentrated acid, applied in the direction of chlorine/hydrogen chloride, etc., can solve the problems of affecting the quality of hydrolyzates, reducing the speed of hydrolysis reaction, difficult to fully contact, etc. loss prevention effect

Active Publication Date: 2011-04-27
BEIJING PETROCHEM ENG +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

But the problem that plagues production is:
[0007]①Under high hydrogen chloride concentration, a layer of hydrogen chloride gas film will be formed on the surface of organochlorosilane particles, making it difficult for water molecules to fully contact with organochlorosilane molecules, thus reducing the Hydrolysis reaction speed
[0009]③ Concentrated acid hydrolysis may also produce chlorine-containing linear siloxane at the end, which affects the quality of the hydrolyzate and further affects the quality of subsequent downstream products

Method used

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  • Method for continuous production of hydrolysate by methylchlorosilane concentrated acid hydrolyzing

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Embodiment 1

[0040] Embodiment 1: technical process such as figure 1 shown.

[0041] Dimethyldichlorosilane and concentrated acid enter the hydrolysis reactor 1 for hydrolysis reaction. The molar ratio of water to methylchlorosilane in the reaction system is 0.14:1, and part or all of the water can come from the primary phase separator 4 And the acidic aqueous solution of the secondary phase separator 5 (for recycling), control the reaction temperature at 35°C, the operating pressure at 0.3Mpa, and the residence time of 55 seconds. The hydrogen chloride generated by the reaction is released from the hydrolysis reactor and processed through the condenser 2 demister 3 Finally, it is discharged from the HCl outlet 14 and can be directly used for the production of methyl chloride. The liquid hydrolyzate is separated through the primary phase separator 4 and the secondary phase separator 5 successively. The oil phase in the upper layer is the acidic hydrolyzate, which enters the steam tower 1...

Embodiment 2

[0043] Embodiment 2: technical process such as figure 1 shown.

[0044] Dimethyldichlorosilane, concentrated acid and oil-containing acidic aqueous solution from the phase separator are metered into the hydrolysis reactor for hydrolysis reaction. The molar ratio of water to methylchlorosilane in the reaction system is 0.15:1, and the water in it can be Part or all of the acidic aqueous solution (for circulation) from the primary phase separator 4 and the secondary phase separator 5, the reaction temperature is controlled at 40°C, the operating pressure is 0.25Mpa, and the residence time is 45 seconds. The hydrogen chloride generated by the reaction is discharged from the hydrolysis reactor After being released by the condenser demister, it can be directly used in the production of methyl chloride. The liquid hydrolyzate enters the primary and secondary phase separators, and the separated upper oil phase is acidic hydrolyzate, which enters the steam tower through the interfac...

Embodiment 3

[0047] Dimethyldichlorosilane, concentrated acid and the oil-containing acidic aqueous solution from the phase separator are metered into the packed tower hydrolysis reactor 1 for hydrolysis reaction. The molar ratio of water and methylchlorosilane in the reaction system is 0.14:1, The water wherein can partly or entirely come from the acidic aqueous solution (recycling) of primary phase separator 4 and secondary phase separator 5, control reaction temperature 40 ℃, operating pressure 0.3Mpa, residence time 55 seconds, the hydrogen chloride that reaction generates After being released from the upper part of the hydrolysis reactor and passed through the condenser demister, it can be directly used for the production of methyl chloride. The liquid hydrolyzate passes through the primary and secondary phase separators, and the oil phase obtained in the upper layer is acidic hydrolyzate, which enters the steam tower through the interface control; the acidic water obtained in the lowe...

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Abstract

The invention relates to a method for hydrolyzing methyl chlorosilane with concentrated acids to obtain hydrolysate, wherein, the methyl chlorosilane and the acidic oil-contained aqueous solution separated from the primary phase separator and the secondary phase separator from the hydrolysate are mixed, pass through a preheater, enter a concentrated-acid hydrolysis reaction system and carry out circular reaction operation; the hydrogen chloride generated in the hydrolysis reaction is released from the top of a tower, goes through a defroster and a condensator and then becomes qualified HCI gas to be used in the production of methyl chloride. Qualified hydrolysate used for decomposition process is obtained after the hydrolysate of methyl chlorosilane goes through four phase separators and a steam tower.

Description

technical field [0001] The invention relates to a hydrolysis process of organosilicon monomer, in particular to a concentrated acid hydrolysis process of methyl chlorosilane. Background technique [0002] Silicone materials are various and ever-changing, mainly divided into four categories: silicone oil, silicone rubber, silicone resin and silane (including silane coupling agent and siliconization reagent). The preparation process of many silicone materials is to first prepare polymethylsiloxane (base polymer) with methyl chlorosilane as raw material, and then introduce other groups such as phenyl, vinyl, chlorophenyl, cyanoalkyl, Fluoroalkyl, etc., so that it has special properties and functions. [0003] Chlorosilane hydrolysis process methods used to be: excess water hydrolysis and azeotropic acid hydrolysis to generate linear polysiloxane and cyclic polysiloxane with hydroxyl groups at the end, that is, hydrolyzate and hydrochloric acid. Because the hydrogen chloride p...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08G77/10C01B7/01
Inventor 孟祥凤刘应春王维东伊港张海磊赵玉芳
Owner BEIJING PETROCHEM ENG
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